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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4433e09a452724efe8b9850fac309fa99f8965bdb86d2c419be8cc7425274ae' 
  AND token = 'oH/u59SAqt2plJRZayyTc35QcNllWRzGSOGSCIp3MXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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