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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '285cb0104ef8dd8cae53de28af987c0dd59779438d73a0f2460a07de4067fc86' 
  AND token = 'Rxb/yf3k64BJMT2naraf8GNFENTK/10l09OQ3O+OItA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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