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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '562a7cc32c4786eac9f994c42e6be6c3403518df88853933f369b169748ffe6f' 
  AND token = 'EVRA2tdAlZZaOSlcFVkA5vDDrV45P43ZqzoB/px4NMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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