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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25b08c26170d5f663f0eb5c39d9805281ecef3e5184946430c811065a7b428c9' 
  AND token = '1kPheVPmzfXIsTg5rSe5MJL5FzEX2zME6D3KQwdadfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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