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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cb81008eacdf5060364675eab99bbca6c4906ef1c830588996dde6793fbe18a' 
  AND token = '/dzjGC8Lxx4GB3l7why6vZ3ZhqKkHUVHwMMH1l5dHkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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