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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e3b734811e7a919ed11caf04ff2d18527b1a5116bd29bcc67ecd44e8f2c18ea' 
  AND token = 'WGD9TYu7OOfRehMX6BruWXHOMLCx4xHrY0ZejiG0iBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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