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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '670e2219ae655f360a93090cf153434800d4a9d7526dbbfa989f01e653765020' 
  AND token = 'DkQRkpaGM2SpUo8wunc6gK8iG0WeePm4dcZjLEfzyyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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