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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c71a51eaa8420b7d21bf8feb1c6f60abef867e65e09bc3d2387bbcdf1b791dea' 
  AND token = 'qmtaJaP80C2yZcUMURztB86E9cNe5MhwN81qL2xlX60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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