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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '436caee653f42d650260b8bd634089663f5cf5469bf1988e7ab0552c3aa11a51' 
  AND token = 'iljA5d0NuVAqdvxekjF/nfKRI3u7HxzUcSkXeMyk+rE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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