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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebd257aec883c29e367b885e59e21f6a46e9628e01b8e8f124d51d15ea5900e2' 
  AND token = 'n9dZF7ZZ8sKlyKtM/eY8Xkpb5xqaPNe/LbcoIRQ+Cos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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