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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b935954001d03d031797a28cdf4dac8e2e1b7367c32ca8f3d0b7e94099e46c83' 
  AND token = 'fgBGi/62u8yUwf4zzPnHmy6+WteDw3TiYEM7JX+9E8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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