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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f98d37d4912ac475785b7cb4d49d0e48e08dad2bf76f5c04ec5ffbe38a62c40a' 
  AND token = 'jAHfssmnf0UmC5bjNAo4Jc3RgvLjeizW09CstVMHObs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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