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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f62dfe3ebadec74522e80bfc028f4dac5198332adb822063d88a4766c6ac691' 
  AND token = '+678+imnU7oxZRtrd+T9ykeEBIGvygmE9UY3AeIyWkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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