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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0689bbe015aed80c752745ea3e06ef7905dca1e98e5b2382e4968ea21c1ed25e' 
  AND token = '5VFfb/ORcl2PnA5fY5RpBEEAstGZMrxSIZxyxPKi5ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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