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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fafeda7e73005f3abcdf4e0e243bc949f25120a65871e8aa08767fe50db333c1' 
  AND token = 'qyjRoUK9NDN0QyfwnugmrUO6iTzBfpY3iT3CjEOtRMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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