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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e05a1f98798fe6b9ad9e91d2df8ef5fd7fde50d2b159f3d09c51f148ad57d9d' 
  AND token = '8Z7DgQv5SWoXGSDh8cY7cANocZXgssu+06fDQMO11lA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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