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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b67f94b4f6c90f9aa2a9760a30ed1f3ca3d6033d86a46d678a18d75ae430d801' 
  AND token = 'CueWlJjIxCZ8WhQlGJ2GABG7jHUIhbzV0SME7HPYqdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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