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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2674469e94a50a172bc0cbd6b848cf2eb9c0bec909765960e8ba6b414e699b5a' 
  AND token = '2f5yudghD7gG/YZHE1osc5hT2NhJiEn+ssFR02qxOO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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