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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a632b1f4b895815ea0f48d6647c6827af1ceac15bcab4d6ba8f00082b0bb3957' 
  AND token = '22wvQSEuijMTU+ku6R9wNsmje7ILd7rD8dVYdZ7L2Uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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