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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a852a024e1786c727e71d5a856b6fa00f78c16ad47ada91cf84f053e70bb46cb' 
  AND token = 'RXVGTWJ2dviMmdOHxRCiuoT7rIOF6c0xj2HjLmXI8bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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