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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebca55982e6ee719ef74ce4eeb4045a5ef2ce82c690056f99dd8e8dc9811c9cc' 
  AND token = '+d5lZyojvcYrqYTdGS8qK6Po9IOc6dGOFIyEWbjwMAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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