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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1b8b0cf8ef927579211ad29d6f75a8368ded66359958fdf7655efff75140a95' 
  AND token = 'lLNI+sve+kKQsg2Y2m3X7Fhy+e/yv5yucW/B55OBOJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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