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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '128683cdee9bae64791588d1b509c4d32fcdd3a077221049d4bc4b5c6543b17e' 
  AND token = '3tvIjMl3G2Q17Bn2MYuVFcc9oXJScvDuH6mb4diCtps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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