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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63193f5144543e840f7ef95eba8dbc5de36b5fb2d202d8b9e156735fad11f84b' 
  AND token = 'UrQuXjcq1U6UpEhU4vX0Zqn0f9eupl7jEceOZCYb+E4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}