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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bffaeaae06daca3d81c4834d67dd69d0e69bec509e9721bed1b17328368e5c6' 
  AND token = 'kTBRNem3nB+3W2Vzm31AxlL5cbyn9tyCndEF1Vupsrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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