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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9cc636ab2bf6fcffaa2355d5a61e044516aa1c38272fbe5c304718bd3865859' 
  AND token = 'H1o6vq6l/yMb0wuasW9B6xycjHpW6tr+tdn2kOnaLKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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