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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb4f3b0cc17a6580c60185ff3f089b5ed02498f55addbaa3eb51accc670d252d' 
  AND token = 'mQr5h26XWP3q9fWSBELzcrUoaOBX8MXDKWYhLKT+P8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00115

JSON explain

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