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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f1417f0c1f3cc2c13e6684766ad99ac5bc5f515e87f75d5f1ba8e26b0456f58' 
  AND token = '64uFBs9SMKGX4ZOppgrWduTIeTqri6ELExNmRKVeq/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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