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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36714c9a7c5c155bb18814f5eaafb808285ed8ae7ecd04346b64b4def95d2d37' 
  AND token = '85go2nTkM8QCHezOwH9aIIrlm0ID+4h29QxZJ4//9jM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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