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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4c6b77d42633b621ccfc675f098c16246463675952746057ac2248cbc1c9d69' 
  AND token = 'e1EwMPnrBCVuKfcYTE7bQ4QWyzh1JZSjTVUkASqx0B0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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