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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee70d82e17db18531579ebcab886e08596ffdbb9b344652c3b8f4654980fc8ad' 
  AND token = 'flof28lDUYuW6KjSzLrwHV5HeU6eRd6Zos3h7Hp0YUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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