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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e3ff4229daa9ce29d488a5c0274137f2b46c70867c05aac02f42446ef231446' 
  AND token = 'g8eGf9iLG7+17CsHwNj+9poSZz9iJUJPPCvl0Ce3WJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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