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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fc34f3a06976edb87f495f8d509aa951f0195692f102fdd6aadc740ad52c9bc' 
  AND token = '9nwwFhDgw2mjSIAJyhpMZ+Xgab6g7dnSGmtGaROR5Ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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