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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07c628a7d6fdb99ed2d3f6c6a5c1af56b5aff79b41030221fc5b6ca84a682b11' 
  AND token = 'KOSyMoWj3zYBPIYdcYNn/F8LvHPEJ2UCpLENxr2habE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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