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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '033b3078a78c0477545ba9d16f825b29794753a61d709468fe5b1c392546f508' 
  AND token = 'a/ACrYOr2viPvOcitw32ZvD4xrbJL5Hhc/9Y6+ll9jE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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