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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e9acf34218c83fa3d39d62997d0a492e96e0249919bdaf466a19cecb4f6fc52' 
  AND token = '5vEu2pRkaJ2euJ6cvCsWxzTQkGH/i2GsDSgK1J4yEUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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