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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd3c3c63c144e5fa2795570d815d166ef2d9cef0887ffd79b70fd3b2c68fe5ce' 
  AND token = 'JqdIXPB+lR1G29d+ozocDynrPM8hjBjQ+6rK9SSzyiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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