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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cc21a5c129b2082b685d117ce6eec155a386de32fcbb2492fd108966a1002d5' 
  AND token = '3fCQy/qo6+djZ2f/uIX5JynD23zOhmekoWsu7VCyNic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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