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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d70a6a363d0411d727f8e06871666d5eaea966a41f375d43a4481ed5ad2b98c' 
  AND token = 'nSLowNkxOjyr958lwVWLm23BaOLlUx9jEa63AzHHFmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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