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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2da516c659e065e2e19c60effc96e989f417efd5ddb87917600d3e7b8e301cdc' 
  AND token = 'Vb1+JoR/Hj9tqo57urwzIl/4XMwcXims0N8fOwhInjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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