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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87b1ce2e3c4c41604c1965513f708967eba6d0f06266577e4c37b339cc15414f' 
  AND token = 'eNy3ztU1qN21UgLYmCuGfNPi/0rnIeBUpBtYyYM7pZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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