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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41c2149f5d621e60a80f4cfcf817a6fe92ac771ad574a4dbd27993c1fb65dc6f' 
  AND token = 'rGPLK2u88HoATwqhT02ED+HuErRSY/XvCls6VAvhet8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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