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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d5819ad1dab22135e67abc450f2dcd1a65b24439f32e20ad82f17ffe299a13a' 
  AND token = '0jqFLFg3CdccfYKvsaW9KsxdFd1ofXMWHlPhyd/hnzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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