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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eda20857e7071c28f5563b8840a3d1e703d8f1031fdb627b74fb0456910fcc1b' 
  AND token = 'x4FSoqI2nyftbjOeq6iipRz3jsYpPgCjh7rMNwte3rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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