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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f59976c5e6640ba73bfbfcd84a89071b19f6edb1eb89a6a9a2c729a7c5103f71' 
  AND token = 'U/bAa5F9Yk/kDXsRFDENR76Rn+eJ27O0C8y9xSNK0Zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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