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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8345fe73b097bf235590a214b21167cb31261fc0e34275795b7a9ab66b9743a' 
  AND token = '8Rdn7HwoyEeZB0ipgUU6IoeIrllFLPr84JKZzIMLSG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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