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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26cddc68f27a7e92153937392b52a9c05312a97b2cf61335419524d972fe4fcd' 
  AND token = 'zhudoGau6wFBpBP0g+kgezdtN4VWPuHlicQhBkfkAi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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