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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f429566fe780c3600e89d3321e56d2482382b04a0f603b938b7a0023547d14b9' 
  AND token = 'wlw8OlAvdjbO0Eug4sGdxouEIyr44ZMe/5QQ9cUmWaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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