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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8c3ab96eee5e6114f1212daf2cc5a7c8a2cbcce7598ea76a6e6fb61ac18913d' 
  AND token = 'ko+7mC2e24OPRgB5bz+1AkzGEuc20jSy6Rfm9Awv8MI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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