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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7460324562302e712340ef1f97ed57cc2a68f6fd5f35f330b8070aa7a615c134' 
  AND token = '7PYzuOidO9wg+RvKQIxgYFcneO0cgbMoip+Uo/Akpsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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