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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e876a8197234f543ea9a955d5aaa6aa5443582e7851ea223e7d453b394c676ad' 
  AND token = 'Tkl+RqYQ1fVAZHXU87/eA+Qxzvx5f7sRWCEsjr+jobQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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