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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '018992bf116046886e24c3b7421a5076b56e7c9a57cb5faf02d0c402780e4ef8' 
  AND token = 'e6/1cJ0yWzgoDrTVvrmJ58FUSDRrmIhFG4KAZq6zPu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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