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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34b57a272e57e9626855dc2abb1cf983f77bec253fa21dbdc14fae830b6512ce' 
  AND token = 'oHS5wWO9+Q4stmdrrgxLtrZTUjU13MbMR2glgd5l9wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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