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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77dfcc90151fd3226fb94fc86a71ea51bd31fa85f239fcf01f58b9b90b7a666c' 
  AND token = 'VpGS9aaY94dpPV8DoBs5c7Ak7EVv5hCgYwwIsoQ92LM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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