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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efa7e512aac12c3e4ffae47282beac41f5a401ed024ac5f6dfb3849b826c0ecd' 
  AND token = 'YRGRnT/ut8SQpu8JAjjSZcOV1ot8InsS6tGfWqf/F6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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