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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1792ad9c08f566167e2d7a220ddf3cd4b2be2e0207b18d9884d90c8dcd851ef8' 
  AND token = 'BRhRoFOd0a/65ap0GeQaxiIMIr7f9FcaSCf8bfTQjEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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