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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99c7b7b4252afd98b7ab0d63572e0b613ac9221db89aa608fa9fc88f8cc5292d' 
  AND token = 'V5oSwrIZwfgwVOgrLV1HEJcEs5gNAAYwRThSYWN11sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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