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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50d7856d96ccd4a9a9dfa18614bd96402cf5658d024338818f6989770164cec1' 
  AND token = 'ePLLfX8bLDM40X03aDJ9Osj9RdXR+i3dT6fk7v3LRd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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