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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f55cc24423c664b04fd921554a9fb79f4edaf618407b97425fc9177f616baba1' 
  AND token = '4OLOiVyGjRvR3YSya7J6J0wX+3NvWGw6p0jdWgt9Llw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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