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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6467dd73b84c386629149086e5487d0b032afe9fec20c4e2ee675b472a1ded1' 
  AND token = 'DY3xI5H6UQL5i7aY9bRbi3v2J4Rbsy0g97mDIpSZqrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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