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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4361e2c8f218c287427e909fddd59352ec2ae21c176391b0b8e98e17168aca26' 
  AND token = 'DKKfVTUX8pM8Yt0JB+Ykvxg35kaiSJmPkZTRGQJAG3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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