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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '479618e1e88aa52774188d0226d17e2ab94b53889c13c51dfaaa0732e03803be' 
  AND token = 'LSk+uhV2ERQPxw5nzPs6GyJcQKKn1fCEkg1cMwF2jzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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