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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e7c159c77d316bca44580c847ecdc9639b17a87e487fe0d954e3ab8e6ad6ec9' 
  AND token = 'g7/CaZLYuA/FrJEf/SHW8a4XDlXhkiTUf2sB2xd8who=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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