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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d9f752935de9ca72195a854c71ef7b7d68f9be8438ab28ffc95ef78499f4550' 
  AND token = '0wKl3g+Bs2KfzIBmiGUnHYHQHlRySHyKne21qHKrqq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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