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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db33af15f899fcf7f8f567d42df366f9ee2df704cf87ed0d94a232d4bd9d43db' 
  AND token = 'KWWzrVF52VMS7vCHxquVoBRczkL54WgJGs2M2YNNrdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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