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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6daf0c24728f8608732133f38c2590d46d9bd26cf3dae7c4ace4886c889dbb7' 
  AND token = '/fB99OAuLQvZmMFVS/zD6p/dMnun7rHkyprc4LopPBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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